<!--<br>-->
<!--<br>-->
<!--<br>-->
<md-nav-bar nav-bar-aria-label="navigation links">
  <md-nav-item md-nav-sref="teacher.exam.single">单个出题</md-nav-item>
  <md-nav-item md-nav-sref="teacher.exam.multiply">批量出题</md-nav-item>
  <md-nav-item md-nav-sref="teacher.exam.lookup">查看题库</md-nav-item>
</md-nav-bar>
<ui-view ></ui-view>